I didn’t follow Gnome 3 and Wayland development for a long time. Now I’d like to thouroughly test proprietary Nvidia drivers on Gnome-Wayland.

Apparently I can’t switch to Wayland on Antergos and Arch. Whichever session is selected at login screen, I always end up in Xorg. There’s no Wayland, neither with default LightDM nor with added GDM. XDG_SESSION_TYPE is always gets set to x11:

There’s no problem to switch between Xorg and Wayland sessions on Tumbleweed, Fedora 26 and even Mageia 6. All three use GDM and have xorg-server-xwayland installed. Weston is not installed. XDG_SESSION_TYPE gets set to wayland:

I’m not a veteran Antergos (or even Linux) user, I should say first.
But yes, I run Wayland on Gnome on Antergos, and I don’t have the weston package installed. I did nothing special that I know of in order to run Wayland on my setup.
The output from the command you wrote:

*there are many ways to do the 3rd step, i used grub-customizer because i think its easier to save and auto update grub…

when i rebooted there was too much lagging i can barely move the mouse cursor and on the conky i saw near 100% cpu usage!!!
am i missing something?
when i opened terminal and executed this:
echo $XDG_SESSION_TYPE
the result was wayland
but as i said my pc wasnt usable because of lag so i reverted back on X11 for now.

This response is going way off-topic, but I can’t leave without a reply the numbers, posted by @qaron above.

In my tests proprietary Nvidia 381.22 has absolutely no impact, neither negative nor positive, on Antergos 17.7 Gnome 3.24.2, independently from the session in use - either Xorg or Wayland.

Initial tests are done on i7 computer with 8G memory and GT 555M Optimus card. Both Bumblebee and proprietary Nvidia driver are installed. No tweaks to system configuration were done. Just a direct Bumblebee installation, as described in Antergos Wiki.

The system behaves absolutely identically, whether it runs on Xorg or Wayland.